Basis of Presentation and Accounting Policies - Narrative (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Accounting Policies [Abstract]
Allowance for doubtful accounts	$ 17.4		$ 17.4		$ 13.1
Allowance for certain customer returns, rebates and incentives	$ 14.6		$ 14.6		$ 13.9
Antidilutive share-based compensation awards (in shares)	0.4	0.6	0.5	0.4
Capital expenditures in accounts payable or other current liabilities at period end			$ 42.5	$ 15.5
Outstanding purchase of common stock recorded in accounts payable			$ 0.8	$ 8.8